Best surfboard for me, Al merrick POD 5'10, Al Merrick Dumpster Diver 5'4", or Al merrick Neckbeard 5'4"?

The pod is a thick board and in general you want to follow the advice of the shaper. That advice is for people who are decent at surfing though. If it was me I would get the dumpster diver. The pod is well too pod shaped for me and probably not as maneuverable. The neckbeard looks fun but idk that flat tail could become a problem on some bigger more powerful waves. That is really a SMALL wave board. I think its only meant for waves up to 4 feet so depends on how you measure but maybe shoulder to head high at the most? Personally with the size waves you ride I would go with the dumpster diver. Also boards come in different sizes so why you should be limited to those three measurements im not sure. That all said you obviously surf, but I dont know what your ability is so its hard to say which board to get. The White Dove is a bigger wave board meant to be really maneuverable and responsive and not a good board for beginners plus a 5'11" would be a few inches taller than one would go for a standard shortboard. I think any of the boards you have listed will be challenging in different ways and will feel a lot different than the white dove but they will float you a little more. Keep in mind that boards like the dumpster diver go for this newer idea of smaller but more volume rather than longer and thinner. They an be tricky to get the hang of because of how short your ride them. But hey this is all just speculation from very little information, sometimes it helps to get another perspective. I would still go to a surf shop, maybe make a trip to santa barbara, and talk to the guys there. See each board in person so you might have a better idea of what suits you. Sometimes you just pick up a board that feels right to you.